Propylene glycol fatty acid ester is an emulsifier made of propylene glycol and stearic acid. It has good foaming and emulsifying properties. It is often used as a foaming agent for cakes and cream cakes. It is also often used in conjunction with other emulsifiers to help Synergistic effect.PGEs are a class of synthetic, nonionic surfactant frequently used in food, pharmaceutical, and cosmetic industries on account of their amphiphilic properties.